#include<bits/stdc++.h>

using namespace std;

int main() {
    int a[] = {1, 6, 2, 5, 1, 2, 3, -99, 123456};
    int n = sizeof(a) / sizeof(a[0]);
    sort(a, a + n);
    cout << a[0] << " ";
    for (int i = 1; i < n; i++) {
        if (a[i] == a[i - 1])continue;
        cout << a[i] << " ";
    }
    return 0;
}
